Can you post the /var/log/{kernel.log,Xorg.0.log,syslog} files on paste.ubuntu.com and place the links in your question?
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LekensteynMar 6 '11 at 14:17

I will add the logs when I will manage to get into ubuntu. Now I am not able to boot.
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albert greenMar 6 '11 at 15:59

I tried to install again, I got a freeze during install. I changed the RAM. same thing. Changed the HDD, same thing. Removed audio card, same thing. video card if the one left, but it is working perfectly on a windows box.
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albert greenMar 6 '11 at 16:01

video card's fan stops randomly. chip heats up, ubuntu freezes. I will change the card and confirm. the strangest thing though is that this card behaves the same way on windows and windows XP doesn't complain at all.
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albert greenMar 6 '11 at 17:45

changed video card to GeForce 6200 and I have the same effect. Ubuntu freezes during install. Ubuntu freezes randomly if I run it from the DVD.
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albert greenMar 6 '11 at 23:49

so I added the acpi=off when booting from the liveCD in order to be able to complete the installation. It worked. Then I added acpi=off in grub.
I used a Kubuntu 10.10 installation, and Kubuntu doesn't have a rc.conf, so setting this value is done like this:

edit the /etc/default/grub file and add acpi=off like this:

GRUB_CMDLINE_LINUX_DEFAULT="**acpi=off** quiet splash"

Must be edited as root.

Then run:

sudo update-grub

Then reboot.

At the moment of this writing, the system has an uptime of 15 hourrs without freezing. I run stress tests, videos, audios and everything looks fine.